— 168 — 



(b) Bar 1 absent 



The bar arrangement has disappeared owing to the fusion of the dorsal por- 

 tions as also of the ventral portions of the pigment. Both dorsal and 

 ventral streaks extend rather far back towards the tail, the unpigmented 

 end of which is in consequence proportionately short. Preanal pigment 

 distinct generally reaching to the anus. Abdominal vertebrae 20 — 22. Gadus pollachins 



The bars remain separate for a long time. Both dorsal and ventral por- 

 tions of bar 2 are somewhat short, so that the unpigmented portion of 

 the end of the tail is proportionately long. Preanal pigment weak gen- 

 erally not reaching to the anus. Abdominal vertebrae 23 — 25 Gadus virens 



II. Main group. Postanal transverse bars not arranged according to the 

 type represented on page 46. (As to Gadus poUacJnus see I Main group. In 

 this species the mediolateral streak begins to appear at a length of 5 mm.) 



(a) The postanal pigment ends abruptly a considerable distance in front 

 of the end of the tail. 



Dorsal pigment extends further back than the ventral. Preanal pigment 

 weak generally not reaching to the anus Gadus Poutassou 



Dorsal pigment does not extend further back than the ventral. Preanal 

 pigment distinct generally reaching to the anus Gadus luscus 



(b) The postanal pigment does not end abruptly a considerable distance 

 in front of the end of the tail. 



(a) The most pronounced and constant portions of the pigment are the 

 anterodorsal and abdominal. Posterodorsal and preanal pigment 

 very weak or wanting. The body in front of the anus is very plump. Gadus ceglefinus 

 (/?) The most conspicuous portions of the pigment are the postanal ventral 

 and dorsal and the anterodorsal is not specially prominent. Preanal 

 pigment distinct. 



The dorsal row of pigment generally extends unbroken from the pec- 

 toral region to near the end of the tail. The ventral row consists of 



numerous small, closely placed chroinatophores Gadus merlangus 



The dorsal row of pigment is broken on the region over the anus 

 and consists of fewer but larger and less closely place.d chromatophores 

 than in Gadus merlangus 

 Number of vertebrae: 48 — 51 (No. of abdominal vertebrae generally: 



14 — -16) : eyes very large Gadus minutus 



Number of vertebrae: 52 — 55 (No. of abdominal vertebrae generally: 



17 — 19) : eyes not very large Gadus Esmarhi 



III. Main group. Only one very short posterolateral transverse 



bar is present. The body is very short and plump Gadiculus argenteus 



B. Stages from about 8—10 up to about 15—20 mm. in length 



I. Main group. Mediolateral streak present. 



(a) The postanal pigment does not end abruptly some distance in front 

 of the end of the tail, which consequently is not in sharp contrast to 



